linux-kernel - Re: [PATCH 1/3] PCI: dwc: Add support for vendor specific capability search

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Date:   Sat, 22 May 2021 01:31:00 +0200
From:   Krzysztof Wilczyński <kw@...ux.com>
To:     Shradha Todi <shradha.t@...sung.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        jingoohan1@...il.com, gustavo.pimentel@...opsys.com,
        lorenzo.pieralisi@....com, robh@...nel.org, bhelgaas@...gle.com,
        pankaj.dubey@...sung.com, p.rajanbabu@...sung.com,
        hari.tv@...sung.com, niyas.ahmed@...sung.com, l.mehra@...sung.com
Subject: Re: [PATCH 1/3] PCI: dwc: Add support for vendor specific capability
 search

Hi Shradha,

[...]
> +u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, u8 vsec_cap)
> +{
> +	u16 vsec = 0;
> +	u32 header;
> +
> +	while ((vsec = dw_pcie_find_next_ext_capability(pci, vsec,
> +					PCI_EXT_CAP_ID_VNDR))) {
> +		header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER);
> +		if (PCI_VNDR_HEADER_ID(header) == vsec_cap)
> +			return vsec;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(dw_pcie_find_vsec_capability);

A small question as I am curious: why not use pci_find_vsec_capability()
here?  The implementation looks very similar, which is why I am asking,
but it might be that I am missing something, and for that I apologise in
advance.

	Krzysztof